Method for decoding a stream of coded data representative of a sequence of images and method for coding a sequence of images

a coded data and image technology, applied in the field of methods for decoding a stream of coded data representative of methods for coding a sequence of images, can solve the problems of loss of efficiency of inter-image (respectively intra-image) prediction, low accuracy of prediction methods, and high bitrate of methods

Active Publication Date: 2012-05-24
INTERDIGITAL MADISON PATENT HLDG
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Problems solved by technology

However, inter-image (respectively intra-image) prediction loses its efficiency when there is a luminosity variation between the images of the sequence (respectively in the current image).
However, such a method is costly in terms of bitrate as it implies the transmission in the stream of ...

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  • Method for decoding a stream of coded data representative of a sequence of images and method for coding a sequence of images
  • Method for decoding a stream of coded data representative of a sequence of images and method for coding a sequence of images
  • Method for decoding a stream of coded data representative of a sequence of images and method for coding a sequence of images

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Embodiment Construction

[0037]The invention relates to a method for decoding a stream of coded data F representative of a sequence of images with a view to the reconstruction of this sequence and a method for coding a sequence of images into the form of a stream of coded data F. A sequence of images is a series of several images. Each image comprises pixels or image points with each of which is associated at least one item of image data. An item of image data is for example an item of luminance data or an item of chrominance data.

[0038]The expression “brightness variation” is also known in English terminology as “luminance variation”, “luminosity variation” or “illumination variation”.

[0039]The term “motion data” is to be understood in the widest sense. It comprises the motion vectors and possibly the reference image indexes enabling a reference image to be identified in the image sequence. It can also comprise an item of information indicating the interpolation type that must be applied to the reference b...

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Abstract

A method for decoding a stream of coded data representative of a sequence of images is disclosed. The decoding method comprises
determining a prediction block,
calculating the average of said prediction block,
reconstructing, from said stream, a DC coefficient and AC coefficients relating to said current block,
calculating an average of said current block from said average of said prediction block and said DC coefficient,
calculating a weighted prediction parameter as being the ratio of the average of said current block and the average of said prediction block,
transforming a block of coefficients comprising a null value as DC coefficient and said reconstructed AC coefficients into a residual block,
reconstructing the current block by merging said residual block and said prediction block weighted by said weighted prediction parameter.
A method for coding is further disclosed.

Description

SCOPE OF THE INVENTION[0001]The invention relates to the general domain of image coding. More specifically, the invention relates to a method for decoding a stream of coded data representative of a sequence of images and a method for coding a sequence of images.PRIOR ART[0002]The majority of methods for coding a sequence of images into a stream of coded data and methods for decoding this stream use temporal prediction or inter-image prediction and equally spatial prediction or intra-image prediction. Intra-image prediction or inter-image prediction enables the compression of an image sequence to be improved. It comprises, for a current block, the generation of a prediction block and the coding of a difference, also called a residual block, between the current block and the prediction block. The more the prediction block is correlated with the current block, the lower is the number of bits required to code the current block and therefore the more effective is the compression. However...

Claims

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Application Information

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IPC IPC(8): H04N7/50H04N7/32
CPCH04N19/105H04N19/503H04N19/137H04N19/46H04N19/176
Inventor THOREAU, DOMINIQUEFRANCOIS, EDOUARDVIERON, JEROMERACAPE, FABIEN
Owner INTERDIGITAL MADISON PATENT HLDG
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